Climate change scientists have started a fightback against sceptics who argue that the observed changes in the Earth's climate can largely be explained by natural variability. This comes after the email hacking furore.

A major Met Office review of more than 100 scientific studies tracking the observed changes in the Earth's climate system finds that it is an "increasingly remote possibility" that human activity is not the main cause of climate change.

The data for the line graph is below, showing measurements on a number of different models, and predictions for the future. Three of the measurements are 'models' - which show what scienetists think has happened. The fourth, the Hadley centre's HadISST, shows actual measurements.